1、道路选线的目的就是可以根据道路的性质、任务、等级和标准，结合当地地

1、道路选线的目的就是可以根据道路的性质、任务、等级和标准，结合当地地质、地表及沿线的条件，再考虑结合平、纵、横三方面的因素，在纸上选定道路中线的位置。而选线要在搜集与路线方案有关的计划、统计资料、各种地形图、地质、气象等资料的基础上，深入调查、勘察现场，确保勘察、调查工作的深度以及质量，不漏掉有较高价值、较有参考性的方案。<br><br>全面布局是解决路线基本走向的全局性工作，在起、终点以及中间必须通过的据点间寻找可能通过的路线带。<br>路线的基本走向与道路的各个条件相适应。限制和影响道路走向的因素很多，主观因素是设计任务书及相关文件规定的路线总方向，等级及其在道路网中的任务和作用，而客观因素就是指道路所经过的地区原有交通的布局、城镇的分布以及地形、地质、气象等自然条件。主观条件是道路选线的主要依据，而客观条件是道路选线必须考虑的因素。<br>在路线基本走向已经确定的基础上，根据地形、地势的不同，分别采取现场直接插点定数和放坡定点的方法，选出一系列的控制点，然后从这些控制点中穿出通过多数点（特别是那些严格控制的点位）的直线段，延伸相邻直线的交点，即为路线的转折点。根据技术指标、自然条件，综合考虑平、纵、横三方面的因素，随后拟定出曲线的半径，至此定线工作才算基本完成。

1、道路选线的目的就是可以根据道路的性质、任务、等级和标准，结合当地地质、地表及沿线的条件，再考虑结合平、纵、横三方面的因素，在纸上选定道路中线的位置。 而选线要在搜集与路线方案有关的计划、统计资料、各种地形图、地质、气象等资料的基础上，深入调查、勘察现场，确保勘察、调查工作的深度以及质量，不漏掉有较高价值、较有参考性的方案。<br><br>全面布局是解决路线基本走向的全局性工作，在起、终点以及中间必须通过的据点间寻找可能通过的路线带。<br>路线的基本走向与道路的各个条件相适应。 限制和影响道路走向的因素很多，主观因素是设计任务书及相关文件规定的路线总方向，等级及其在道路网中的任务和作用，而客观因素就是指道路所经过的地区原有交通的布局、城镇的分布以及地形、地质、气象等自然条件。 主观条件是道路选线的主要依据，而客观条件是道路选线必须考虑的因素。<br>在路线基本走向已经确定的基础上，根据地形、地势的不同，分别采取现场直接插点定数和放坡定点的方法，选出一系列的控制点，然后从这些控制点中穿出通过多数点（特别是那些严格控制的点位）的直线段，延伸相邻直线的交点，即为路线的转折点。 根据技术指标、自然条件，综合考虑平、纵、横三方面的因素，随后拟定出曲线的半径，至此定线工作才算基本完成。

1. The purpose of road alignment is to select the location of the road centerline on paper according to the nature, task, grade and standard of the road, combined with the local geology, surface and the conditions along the road, and considering the horizontal, vertical and horizontal factors. On the basis of collecting planning, statistical data, various topographic maps, geological, meteorological and other data related to the route scheme, in-depth investigation and field survey shall be conducted to ensure the depth and quality of the investigation and investigation work, and no valuable and reference scheme shall be omitted.<br>Comprehensive layout is the overall work to solve the basic trend of the route. It is necessary to find the possible route belt between the starting point, the ending point and the positions that must pass in the middle.<br>The basic trend of the route is suitable for various conditions of the road. There are many factors that restrict and affect the direction of the road. The subjective factors are the general direction of the route specified in the design specification and related documents, the grade and its task and role in the road network. The objective factors are the layout of the original traffic, the distribution of towns and the natural conditions such as topography, geology and meteorology in the area where the road passes. Subjective conditions are the main basis of road route selection, while objective conditions are the factors that must be considered in road route selection.<br>On the basis of the determination of the basic trend of the route, according to the different terrain, the method of directly inserting the number of points and grading points on site is adopted to select a series of control points, and then the straight line section passing through most points (especially those strictly controlled points) is penetrated from these control points to extend the intersection of adjacent straight lines, which is the turning point of the route. According to the technical indicators and natural conditions, the horizontal, vertical and horizontal factors are considered comprehensively, and then the radius of the curve is worked out, so far the setting out work is basically completed.<br>